The future SKA-low will provide an extremely dense and very homogeneous antenna array on an area of roughly 0.5 km$^2$ and with a large bandwidth of 50-350 MHz. With minor engineering changes it would be ideally suited to detect extensive air showers initiated by cosmic rays in the Earth’s atmosphere via their pulsed radio emission. The very precise measurements of individual cosmic-ray air-shower events allows detailed studies of the mass composition in the energy range around 10$^{17}$ eV where the transition from a galactic to an extragalactic origin could occur. We present a simulation study on cosmic-ray detection with focus on the potential to reconstruct the depth of shower maximum for individual showers to be measured with SKA-low, resulting in an expected intrinsic uncertainty on the X$_{\mathrm{max}}$ reconstruction of less than 10 g/cm$^2$. We will discuss the dependencies of the uncertainty on the direction and energy of the primary as well as the parameters of the antenna array, e.g. the analysed bandwidth and antenna density.